<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="botton-list">
          <div class="button-wrapper">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="botton-list">
          <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item,key) of cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id"  @click="handleCityClick(innerItem.name)">{{innerItem.name}}</div>
        </div>
      </div>
    </div>
  </div>
</template>
<script>
import Bscroll from 'better-scroll'
import {mapState,mapMutations} from 'vuex'
export default {
  name:'CityList',
  props:{
    hot:Array,
    cities:Object,
    letter:String
  },
  //侦听器
  watch:{
    letter(){
      if(this.letter){
        const element = this.$refs[this.letter][0];
        this.scroll.scrollToElement(element);
      }
    }
  },
  mounted() {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  methods:{
    handleCityClick(city){
      //先派发
      //若没有异步或批量操作可直接使用this.$store.commit('changeCity',city),直接调用mutations中的changeCity方法修改数据
      this.$store.dispatch('changeCity',city);
      //执行页面的跳转
      this.$router.push('/');
    },
    ...mapMutations(['changeCity'])
  },
  computed:{
    ...mapState({currentCity:'city'})
  }
}
</script>
<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color #ccc
    &:after
      border-color #ccc
  .border-bottom
    &:before
      border-color #ccc
  .list
    overflow hidden
    position absolute
    top 1.68rem
    left 0
    right 0
    bottom 0
    .title
      line-height .44rem
      background-color #eee
      padding-left .26rem
      color: #666
    .botton-list
      overflow hidden
      padding .1rem .6rem .1rem .1rem
      .button-wrapper
        float left
        width 33.33%
        .button
          text-align center
          padding .1rem 0
          border-radius .06rem
          margin .1rem
          border .02rem solid #ccc
    .item-list
      .item
        line-height .76rem
        color #666
        padding-left .2rem



</style>
